基于激发极化法的隧道含水地质构造超前探测研究

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Abstract The water inrush hazards have become one of the bottleneck problems that constrain the construction of underground engineering such as tunnels. The advanced detection of the water-bearing geological structures especially estimation of the water volume in tunnel construction period has become an important scientific and engineering problem to be studied and solved urgently. For the above problems，the solving method with the induced polarization(IP) method as the guide is proposed. The advanced geological prediction with IP method in tunnel faces with a lot of new problems to be studied and solved urgently in contrast with shallow exploration. The special IP instrument for tunnel advanced detection is developed. The thought for solving the problem of water-body location with apparent resistivity is presented；and the three-dimensional(3D) tomography method of water-bearing structures advanced detection based on 3D resistivity inversion method and its computation scheme is proposed. The basic problems of tunnel advanced detection are solved(e.g. solution of point source field in 3D whole space，3D measurement mode，recognition and removal of the measurement disturbance，inversion target region). The feasibility and effectiveness of 3D tomography for water-bearing structures has been proved by massive inversion examples. For the problem of water volume estimation，the method based on half-decay time difference of two-current induced polarization is put forward. It is found that the relation between difference of half-decay time and water volume is linear positive correlation by physical model test. And this linear positive correlation lays a solid foundation for water volume prediction of water-bearing structures in practical engineering. In the end，advanced detection technical system with IP method for tunnel water-bearing geological structures is formed. And this technical system is introduced into geological forecast work in tunnel engineering. The prediction results are basically identical with the practical excavation results. Practical application demonstrates that the problem of advanced detection for tunnel water-bearing structures especially the water volume estimation is solved effectively with prediction technique of IP method；and it has good application prospect and popularization value which extends the function of advanced geological prediction technique.

Key words： tunnelling engineering water-bearing geological structures advanced geological prediction induced polarization(IP) method three-dimensional(3D) tomography water volume estimation

Received: 19 May 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I7/1297

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